I can answer that WK

Back in the 70's my dad was flying a pattern plane, and I was his caller. As he crossed the threshold for a low runway pass, the plane suddenly wobbled, did a half roll to inverted, then smashed spectacularly into the runway.

Cause: The battery pack had been in a previous crash and the two leads had not-previously-noticed bare spots in the wires.

Pack shorted out, plane came down -BOOM!